Effect of lithotripter focal width on stone comminution in shock wave lithotripsy.
| dc.contributor.author | Qin, Jun | |
| dc.contributor.author | Simmons, W Neal | |
| dc.contributor.author | Sankin, Georgy | |
| dc.contributor.author | Zhong, Pei | |
| dc.coverage.spatial | United States | |
| dc.date.accessioned | 2011-06-21T17:27:44Z | |
| dc.date.issued | 2010-04 | |
| dc.description.abstract | Using a reflector insert, the original HM-3 lithotripter field at 20 kV was altered significantly with the peak positive pressure (p(+)) in the focal plane increased from 49 to 87 MPa while the -6 dB focal width decreased concomitantly from 11 to 4 mm. Using the original reflector, p(+) of 33 MPa with a -6 dB focal width of 18 mm were measured in a pre-focal plane 15-mm proximal to the lithotripter focus. However, the acoustic pulse energy delivered to a 28-mm diameter area around the lithotripter axis was comparable ( approximately 120 mJ). For all three exposure conditions, similar stone comminution ( approximately 70%) was produced in a mesh holder of 15 mm after 250 shocks. In contrast, stone comminution produced by the modified reflector either in a 15-mm finger cot (45%) or in a 30-mm membrane holder (14%) was significantly reduced from the corresponding values (56% and 26%) produced by the original reflector (no statistically significant differences were observed between the focal and pre-focal planes). These observations suggest that a low-pressure/broad focal width lithotripter field will produce better stone comminution than its counterpart with high-pressure/narrow focal width under clinically relevant in vitro comminution conditions. | |
| dc.description.version | Version of Record | |
| dc.identifier | ||
| dc.identifier.eissn | 1520-8524 | |
| dc.identifier.uri | ||
| dc.language | eng | |
| dc.language.iso | en_US | |
| dc.publisher | Acoustical Society of America (ASA) | |
| dc.relation.ispartof | J Acoust Soc Am | |
| dc.relation.isversionof | 10.1121/1.3308409 | |
| dc.relation.journal | Journal of the Acoustical Society of America | |
| dc.subject | Acoustics | |
| dc.subject | Calculi | |
| dc.subject | Equipment Design | |
| dc.subject | Lithotripsy | |
| dc.subject | Materials Testing | |
| dc.subject | Models, Theoretical | |
| dc.subject | Motion | |
| dc.subject | Phantoms, Imaging | |
| dc.subject | Pressure | |
| dc.subject | Time Factors | |
| dc.subject | Transducers, Pressure | |
| dc.title | Effect of lithotripter focal width on stone comminution in shock wave lithotripsy. | |
| dc.title.alternative | ||
| dc.type | Journal article | |
| duke.date.pubdate | 2010-4-0 | |
| duke.description.issue | 4 | |
| duke.description.volume | 127 | |
| pubs.author-url | ||
| pubs.begin-page | 2635 | |
| pubs.end-page | 2645 | |
| pubs.issue | 4 | |
| pubs.organisational-group | Biomedical Engineering | |
| pubs.organisational-group | Duke | |
| pubs.organisational-group | Mechanical Engineering and Materials Science | |
| pubs.organisational-group | Pratt School of Engineering | |
| pubs.publication-status | Published | |
| pubs.volume | 127 |